Board of Governors of the Federal Reserve System (U.S.), 1935-. "Electric Power Use: Manufacturing and Mining," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "July 15, 1991," G.17 Industrial Production and Capacity Utilization (1991-07-15) : 16-17. https://fraser.stlouisfed.org/title/77/item/63592/toc/454830 , accessed on June 18, 2024.